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How to sumarize longotudinal data by patients and plot it?

Hi all, I'm trying to summarize some longitudinal data that looks like this: 

ID Time_point   treatment
20  4            Treated
20  7            Treated
20  9            Treated
20  12           Treated
20  21           Treated
 28 4            No Treated
28  7            No Treated
28  12           No Treated
28  14           No Treated
28  18           No Treated
28  21           No Treated
29  4            Treated
29  7            Treated
29  12           Treated

The principal characteristic of the data is that not all the IDs has the same time points. I would like to plot the data (by patients) using some bar plot in R, any idea about how to do it? Thanks!

longitudinal data summary plot
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written by Lila M 130

Can you describe what this bar plot would depict, and what its axes would be?

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written by Ram 4.5K

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